and at night They are a constant reminder of the peace and serenity found in nature The mention of standing on the roadway or on the pavements grey emphasises the contrast between the urban environment characterized by noise and concrete and the natural beauty of Innisfree The speaker dreams of the simplicity and tranquillity of the countryside symbolized by the lake's gentle sounds The concluding line I hear it in the deep heart's core highlights the profound impact that the memory of Innisfree has on the speaker It's not just a physical journey but a spiritual one as well The deep heart's core conveys a deep emotional longing for a connection to nature and a simpler life In termination this quotation from Yeats' poem describes themes of escapism the beauty of nature and the yearning for a more peaceful existence It says to the universal human desire to find solace and meaning in the natural world away from the complexities of modern life